Avoid calling translate_exception with non-PGError exceptions.

translate_exception was changed and now expects the exception to respond to "result", here:  rails#6397
ActiveRecord::StatementInvalid, which is the exception sometimes caught and retried in the "connection retry" logic, does not respond to "result" and fails on the call to translate_exception.

Fixes replication test suite failure.

This fix can be squashed with the other "connection retry" commit (21e4354) on future upgrades.

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -1285,9 +1285,8 @@ def with_auto_reconnect
         begin
           yield
         rescue Exception => e
-          case translate_exception(e,e.message)
-            when LostConnection; retry if auto_reconnected?
-          end
+          retry if auto_reconnected? && e.message =~ Regexp.union(*lost_connection_messages)
+
           raise
         end
       end